Exhaust apparatus for roller-mills.



No. 740,155. HAL'EENTED SEPT. 29, 1903.

A. (L. MATHER.

EXHAUST APPARATUS FOR ROLLER; MILLS. APPLICATION 111mm JULY 30. 1902..

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ALLAN-G. JMATHER, or airnwnunsn, WISCONSIN.-

EXHAUST APPARATUS FOR ROLLER-MILLS.

SPEGIFIGATIGN forming part of Letters Patent No. 740,155, dated September 29, 1903.

' Application filed July 30, 1902.

To all whom it may concern:

Be it known that I, ALLAN G. MATHER, residingat Milwaukee, in the county of Milwaukee and State of Wisconsin, haveinvented a new and useful Improvement in Exhaust Apparatus for Roller-Mills, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification.

My invention relates to improved means for withdrawing dust-laden air from rollermills, &c. It is common to employ air-suction devices in connection with roller-mills and other machinery producing dust or comminuted foreign material from pulverizing, grinding, or abrading machinery to remove such dust or foreign material therefrom, and my improved devices are specific forms of apparatus for carrying away such dustladen air and at the same time for clearing the flue or trunk employed of all dust or foreign matter that would otherwise be deposited in it, and thereby obstruct it and interfere with its best and most desirable action.

The invention consists of the apparatus, its parts, and combinations of parts as herein described and claimed or the equivalents thereof.

In'the drawings, Figure 1 illustrates a fragment of an air flue or trunk provided at one end with a suction-fan and showing fragments of air-pipes leading to the trunk from a plurality of roller-mills or other grinding or pulverizing machine, parts of the trunk being broken away to show interior construction. Fig. 2 isa longitudinal section of afragment of the trunk, showing a means for di recting the current of air passing through'the trunk. Fig. 3 is an end view of the fragment of the trunk shown in longitudinal section in Fig. 2. Fig. 4 is a longitudinal section of a fragment of the trunk showing another form of means for directing the current of air passing through the trunk. Fig. 5 is an end View of the construction shown in Fig. 4. In the drawings, 6 represents a horizontal trunk, preferably in round tubular form, provided at its distant end with a suction-fan at '7 for drawing or sucking air into and through the trunk and discharging it at the fan end. This trunk and the suctionan may be supported on. a floor or ledge S or on any suitable Serial No. 117.626. (No model.)

far described the dust-laden air by the operation of the fan will be drawn into the trunk and discharged therefrom; but it is desirable that the air shall be given such a movement in the trunk as to prevent the deposit of dust or other foreign matter by gravityinthetrunk. For this purpose I employ means within the trunk for giving the air a circular or gyratory motion spirally in and through the trunk. In the drawings I have shown two. forms of devices for this purpose. In Figs. 2 and 3 a deflector is shown consisting of a blade or wing 10, advisably of sheet metal cut in aeurved and advisably substantially semicircular form, which blade is applied to the inner surface circumferentially of the trunk, in a direction oblique or spirally of its length. I also advisably place this blade in the trunk so that it will medially cross the entrance of an airline 9 into the trunk, and in this position the plane of the blade where it crosses the mouth of the air-flue will be in the extension of the longitudinal axis of the air-flue. This form and arrangement of the blade 10 in the trunk will-give the air as it is drawn through the trunk a gyratory spiral motion that will keep the trunk clear of any deposit of dust or foreign matter therein. Where there is more Patented September 29, 1903.

than one air-flue 9 leading into the trunk it will be desirable to place one of these blades in the trunk at the mouth of each air-flue coming into the trunk, and, in fact, other blades of this character may be placed in the trunk at other localities than the mouth of the air-fines.

In Figs. 4 and 5 I have shown another form of deflector, which consists of a hood 11, advisably of sheet metal, which is secured at one edge to the inner wall of the trunk and projecting therefrom extends inwardly in front of an air-flue 9 to a distance beyond the flue, terminating in an edge located at a dis' tance from the inner Wall of the trunk. This hood preferably diverges from its edge that is secured to the trunk suificiently to leave a free space for the passage of air from the airflue into the trunk, but so as to deflect this incoming air in a direction around the trunk, whereby the air cominginto the trunk by suction will. be given a gyratory and spiral motion therefrom to its place of discharge from the trunk. Where there are several air-fines entering the trunk, a hood of this character should be placed over the mouth of each airflue;

What I claim as my invention is 1. In an air-withdrawin g apparatus, a tubular trunk in substantially horizontal position, an air-flue leading into the trunk substantially in a radial plane; and a deflector Within the trunk disposed to direct the current of air passing through the trunk into a gyratory and spiral direction.

2. In an air-WithdraWin g apparatus, a tubular trunk in substantially horizontal position, an air-flue leading into the trunk in a radial line, and a deflector Within the trunk located at the mouth of the air-flue adapted to direct the column of air passing into and through the trunk into a gyratory spiral direction.

3, An apparatus for Withdrawing dust-laden air, comprising a tubular trunk in horizontal position and having means for drawing air through it, a plurality of air-fiues leading into the trunk in radial lines thereto, and deflectors in and secured to the trunk formed and disposed to deflect the air passing through the trunk into a gyratory spiral current.

4. In an air and dust Withdrawing appara- 

